End stop for thermoplastic fasteners



Nov. 5," 1940. D. MARINSKY END STOP FOR THERMOPLASTIC FASTENERS ori inalFiled March 6, i937 INVENTOR 0414a A74/P/MsA r ATTORNE Patented Nov. 5,1940 UNITED STATES END STOP.

FOR. THERMOPLASTIC FASTENERS Davis Marinsky, Bronx, N. Y., assignor toWhite hall Patents Corporation, Bronx, N. Y., a corporation of New YorkApplication March 6,

1937, Serial No. 129,316

Renewed February 7-, 1940 3 Claims.

This invention relates to separable fasteners employing linked stringersadapted to be coupled and uncoupled by a slider movable longitudinallyof the links of said stringer in coupling and uncoupling the same andparticularly to the formation of end stops at the ends of the stringersto limit the travel of the slider thereon; and the object of theinvention is to provide the ends of the stringers with stops formedentirely or partially by the links employedin forming the stringers soas to produce a simple and economical construction as well as a neat andfinished appearance on the resulting fastener; a further object being toprovide an end stop construction for fastener stringers which is made inaccordance with the method morefully hereinafter described and claimed.

The invention is fully disclosed in the following specification, ofwhich the accompanying drawing forms a part, in which the several partsof my invention are designated by suitable reference characters in eachof the-views, and in which:

Fig. 1 is a plan view of a fastener made according to my invention, withpart of the construction broken away.

Fig. 2 is a detail view of one end of a fastener stringerdiagrammatically illustrating the method of stacking or launching linksthereon.

Fig. 3 is an enlarged detailedge view of one stringer, diagrammaticallyshowing the method of securing the bunched or stacked links together,said figure being a view substantially looking in the direction of thearrows 3-3 of Fig. 1.

Fig. 4 is a partial section on the line 4-4 of Fig. 1, showing the otherend stop which I employ; and,

Fig. 5 is a view similar to Fig. 4 showing a modifled form ofconstruction.

In Fig. 1 of the drawing, I have shown at I0 and II the stringers of aseparable fastener having attached to the beaded edges l2 and i3 thereofa plurality of longitudinally spaced coupling links it and I5. At I6, Ihave shown a slider movable longitudinally of the links to couple and 5uncouple the same, said slider having a finger piece or pull I l tofacilitate the operation thereof. The links It and I in the constructionshown are preferably made from a plastic or thermoplastic material, suchfor example as cellulose 50 acetate. These links may be clamped upon thestringer tapes I, II, or the beaded edges l2, l3 thereof or directly diecast thereon. It is pre-" ferred that the beaded edges have rayon orother strands I211, [3a extending longitudinally thereof 66 to contactthe respective links to aid in securing or cementing the links to thestringers, especially when subjecting the stringer tapes to a saturatingsolution in the form of a solvent, such for example as acetone which, bycapillary attraction, extends to the inner surfaces of the links where 5they contact the tapes to form a cementing area between the links andtape. This structure and method is in accordance with the teachings inmy companion application Serial No. 129,321, filed of equal dateherewith. If desired, slight pressure may be applied to the links in thecementing operation as well as the application of heat sufflcient onlyto aid in setting or hardening the cement, all as taught in a companionapplication filed of equal date herewith.

In the operation of forming my improved stringers or the end stops atthe ends of said stringers, each stringer tape is formed in theconventional manner with all of the links l4-l 5 applied thereto in anequally spaced manner. ,The first step in forming end stops ill at oneend of the stringer is as follows. Four of the end links are forcedlongitudinally of the stringer tape by a suitable fork-shaped tool l9 asindicated in Fig. 2 of the drawing in which the links M are shown on thetape l 0. This operation is performed after acetone or slight heat hasbeen applied to said four links to soften the same sufliciently toprovide free action or sliding movement longitudinally of the beadededge I! of the tape, and

- especially in the case of die cast links which are applied to saidtapes. When these links are brought into the stacked or piledrelationship with the projecting beads lBa of the links extending intorecesses on the opposed surface of adjacent links, said links are thensecured together by applying a suitable cement or solvent thereto, forexample, by spraying a cement or solvent such as acetone in the mannerindicated at 20 in Fig. 3 of the drawing to one or both side surfaces ofthe links, and then allowing the solvent or cement to dry. If desired,slight pressure may be applied to the links in this operation. However,if all of the links are to be cemented to the tapes In as above stated,the pressing operation may be performed in the aforesaid cementingoperation. All of the stacked or grouped links forming the end stops l8,in addition to being cemented together on adjacent abutting surfaces,will also be cemented to the tape I 0 or the beaded edge thereof.

In the accompanying drawing, the end stop l8 on the stringer illconsists of five links, whereas the stop It on the stringer ll consistsof four links, but this is simply to provide a balanced 55 finished endto the complete stringer. But, if desired, any number of the-links maybe provided, it'being understood that two links Joined on each stringerwill block or stop further progress of the slider along the stringers.With the present construction, the slider I6 is capable of extending thefull length of the stringers or to a point in alinement with th outerlink of each stop l8, or substantially so.

End stops such as I8 will provide a neat and finished-appearance to oneend of the stringers, and a uniform construction will be providedthroughout the entire stringer in so far as the link and end stop I8 isconcerned. The same result or substantially the same result can also beaccomplished at the other end of the stringers by simply providing astop plate or sheet 2| of cellulose acetate or similar material,preferably of a color consistent with that of the color employed in thelinks H and l5.

This plate 2| is arranged upon a number of the interlocked end links 22of the stringers l and II and is secured thereto by a cement or adhesive23 such for example as acetone which may first be spread onto thecoupled links 22 and onto one surface of the plate 2|, and then saidplate attached or mounted in position in the manner shown in Fig. 1 ofthe drawing and slight pressure may be applied to secure and retain theplate 2| in position, and this may be done in the presence of heat ifdesired.

' In Fig. 5 of the drawing,'I have shown a modi-.

fication which consists simply in including a supplemental stop plate 2la at the lower surface of the stringers to provide a double stop. Theplate 2|a is secured in position at the same time that the plate 2| issecured or directly thereafter as may be desired. By using acetone orcellulose acetate fasteners a substantial weld is provided between theparts secured together which provides a strong and durable construction.Thus, it will be seen that a very simple and economical form of end stopis provided for both ends of the stringers while at the same timeeliminating the use of metallic parts or parts of complicatedconstruction, thus materially reducing the cost of manufacture of thecomplete device.

The slider l6 as well as the pull l'l may also be composed of plasticmaterial of the type and kind under consideration, but these membersform no specific part of the present invention.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. In separable fasteners of the class described employing a fibrousstringer tape having thermoplastic links attached to one edge thereofand spaced longitudinally of the stringer, means forming an end stop atone end of the stringer, sand means comprising a plurality of linksarranged in nesting and abutting relationship one with respect to theother and secured together by a solvent for said links, said stringerbeing saturated with the solvent to cement that part of the linksengaging the stringer against displacement therefrom, that part of thestringer to which the links are attached having an enlarged beaded edge,and said beaded edge including rayon strands interwoven with the fabricthereof.

2. In separable fasteners of the class described, a stringer tapecomposed of fibrous material, thermoplastic links attached to one edgethereof and spaced longitudinally of the tape, a rayon thread arrangedlongitudinally of said edge of the tape and exposed therethrough tocontact each of said links, a solvent for said links and thread appliedthereto in securely cementing the links to said edge of the tape, and aplurality'of links at one end of the stringer tape being arranged oneupon the other and secured together to form an end stop.

3. In separable fasteners of the class described employing stringertapes and thermoplastic coupling links spaced longitudinally of thetapes and adapted to be coupled and uncoupled, rayon threads extendinglongitudinally of that portion of the tapes to which the links areattached and contacting said links to aid in securing all of the linksto said tapes, a solvent for said links and threads applied to the tapesin securing the links thereof, and predetermined end links of the tapesbeing arranged in nesting and abutting relationship and secured togetherand to said tapes by said solvent.

DAVIS MARINSKY.

